ChromeOS: implement per-user time zone preferences.

chrome/browser/ui/webui/chromeos/set_time_ui.cc

Index: chrome/browser/ui/webui/chromeos/set_time_ui.cc
diff --git a/chrome/browser/ui/webui/chromeos/set_time_ui.cc b/chrome/browser/ui/webui/chromeos/set_time_ui.cc
index 98871678f7e8a217b48ccf01af37e73d426bafec..67e0a5db92dfd50eb2fb44fdb20e3585e5e381ad 100644
--- a/chrome/browser/ui/webui/chromeos/set_time_ui.cc
+++ b/chrome/browser/ui/webui/chromeos/set_time_ui.cc
@@ -15,6 +15,8 @@
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 #include "chrome/browser/chromeos/system/timezone_util.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/browser_resources.h"
 #include "chrome/grit/generated_resources.h"
@@ -22,6 +24,8 @@
 #include "chromeos/dbus/system_clock_client.h"
 #include "chromeos/login/login_state.h"
 #include "chromeos/settings/timezone_settings.h"
+#include "components/prefs/pref_service.h"
+#include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui.h"
 #include "content/public/browser/web_ui_data_source.h"
 #include "content/public/browser/web_ui_message_handler.h"
@@ -63,6 +67,10 @@ class SetTimeMessageHandler : public content::WebUIMessageHandler,
     web_ui()->CallJavascriptFunctionUnsafe("settime.TimeSetter.updateTime");
   }
 
+  // UI actually shows real device timezone, but allows to change only user

[stevenjb, 2017/05/15 17:08:02]

s/to change only user timezone/only allows changing the user timezone/

[Alexander Alekseev, 2017/05/16 01:11:56]

Done.

+  // timezone. If user timezone settings are different from system, this means
+  // that user settings are overriden and must be disabled. (And we will still
+  // show the actual device timezone.)
   // system::TimezoneSettings::Observer:
   void TimezoneChanged(const icu::TimeZone& timezone) override {
     base::Value timezone_id(system::TimezoneSettings::GetTimezoneID(timezone));
@@ -93,8 +101,13 @@ class SetTimeMessageHandler : public content::WebUIMessageHandler,
       NOTREACHED();
       return;
     }
-
-    CrosSettings::Get()->SetString(kSystemTimezone, timezone_id);
+    Profile* profile = Profile::FromBrowserContext(
+        web_ui()->GetWebContents()->GetBrowserContext());
+    DCHECK(profile);
+    Profile* primary_profile = ProfileManager::GetPrimaryUserProfile();
+    if (primary_profile && profile->IsSameProfile(primary_profile)) {
+      profile->GetPrefs()->SetString(prefs::kUserTimezone, timezone_id);
+    }
   }
 
   DISALLOW_COPY_AND_ASSIGN(SetTimeMessageHandler);